Elevated microwave heating tray

ABSTRACT

Various blanks and constructs formed therefrom are provided. The various constructs include features for supporting a food item at an elevated position to enhance the heating, browning, and/or crisping of the food item in a microwave oven.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/384,855, filed Apr. 9, 2009, which is a continuation of InternationalApplication No. PCT/US2007/082477, filed Oct. 25, 2007, which claims thebenefit under 35 U.S.C. §119(e) of U.S. Provisional Application No.60/854,482, filed Oct. 26, 2006, all of which are incorporated byreference in their entirety as though fully set forth herein.

TECHNICAL FIELD

The present invention relates to various blanks, constructs, and methodsfor heating, browning, and/or crisping a food item, and particularlyrelates to various blanks, constructs, and methods for heating,browning, and/or crisping a food item in a microwave oven.

BACKGROUND

Microwave ovens provide a convenient means for heating a variety of fooditems, including dough-based products such as pizzas, pies, andsandwiches. However, microwave ovens tend to cook such items unevenlyand are unable to achieve the desired balance of thorough heating and abrowned, crisp crust. Thus, there is a continuing need for amicrowavable package that provides the desired degree of heating,browning, and crisping of the crust or dough of a food item.

SUMMARY

The present invention is directed generally to various blanks,constructs formed from such blanks, and methods of making such blanksand constructs. The various constructs include one or more features thatelevate a food item from the turntable and/or the interior floor of themicrowave oven. By elevating the food item in this manner, more heat maybe retained by and/or directed to the food item, rather than being lostto the turntable or to the floor of the microwave oven. As a result, themicrowave heating efficiency is improved significantly.

In one aspect, the present invention contemplates a blank for forming aconstruct. The blank includes a plurality of adjoined panels, each ofwhich has a first dimension extending in a longitudinal direction and asecond dimension extending in a transverse direction substantiallyperpendicular to the first direction. The plurality of panels includes amain panel, a pair of substantially opposed side panels joined to themain panel along respective substantially opposed longitudinal foldlines, and a pair of substantially opposed end panels joined to the mainpanel along respective substantially opposed transverse fold lines. Inone variation, the blank is substantially symmetrical when viewed alonga transverse centerline and/or a longitudinal centerline.

The blank also may include a pair of substantially opposed side portionsadapted to be at least partially separated from the blank. Each sideportion may be defined by a plurality of tear lines including a pair ofsubstantially opposed transverse tear lines extending substantiallyacross the respective side panel into the main panel and a longitudinalline of disruption extending between the respective pair ofsubstantially opposed transverse tear lines. A pair of end flaps may bejoined to respective opposed longitudinal ends of each side panel. Inone variation, the end flaps are joined to the respective longitudinalends of each side panel along respective oblique fold lines.

Various shapes are contemplated for the panels that form the blank. Inone example, the main panel is substantially rectangular in shape. Inanother example, the side panels are substantially trapezoidal in shape.In still another example, the end panels are substantially trapezoidalin shape.

In another aspect, the invention contemplates a construct for heating,browning, and/or crisping a food item in a microwave oven. The constructincludes a platform comprising a microwave energy interactive material,a pair of side panels extending substantially downwardly from a firstpair of opposed edges of the platform along respective first fold linesextending in a first direction, and a pair of end panels extendingsubstantially downwardly from a second pair of opposed edges of theplatform along respective second fold lines extending in a seconddirection substantially perpendicular to the first direction.

The construct also includes a pair of substantially opposed adjustablewall portions at least partially defined by a pair of substantiallyvertical tear lines in each side panel. The adjustable wall portions areadapted to be transformed into opposed walls for the platform by tearingalong the substantially vertical tear lines in each side panel androtating the walls upwardly along the respective first fold line. In onevariation, the adjustable wall portions are each further at leastpartially defined by a pair of tear lines extending in the seconddirection from the respective first fold line into the main panel. Eachtear line that extends into the main panel is substantially aligned withthe respective vertical tear line in the respective side panel. Inanother variation, the adjustable wall portions are each further atleast partially defined by a line of disruption extending in the firstdirection substantially between respective endpoints of the pair of tearlines extending into the main panel. In this variation, each adjustablewall portion is adapted to be transformed into a wall for the platformby tearing along the substantially vertical tear lines in the side paneland along the tear lines extending into the main panel. The wall thencan be rotated upwardly along at least one of the respective first foldline and the line of disruption extending in the first direction. Theadjustable wall portion may have any suitable shape and, in one example,the adjustable wall portion is substantially rectangular in shape.

If desired, the construct may include a pair of end flaps foldablyjoined to opposed ends of each respective side panel along respectiveoblique fold lines. The end flaps may be in a substantially contacting,facing relationship with the respective end panel and may be joined tothe respective end panel adhesively or otherwise.

In still another aspect, the invention encompasses a construct comprisesa platform including a central portion and a pair of end portionsdisposed at opposed ends of the central portion. The central portion andeach of the end portions have a first dimension extending in a firstdirection and a second dimension extending in a second dimensionsubstantially perpendicular to the second direction. The seconddimension of each end portion is greater than the second dimension ofthe central portion. A plurality of support elements extendsubstantially downwardly from each end portion of the platform.

The construct further comprises a pair of adjustable side walls. Eachwall may include a proximal panel hingedly joined to the central portionof the platform along a first fold line extending in the first directionand a distal panel hingedly joined to the proximal panel along a secondfold line extending in the first direction. The proximal panel and thedistal panel each have a first dimension extending in the firstdirection and a second dimension extending in a crosswise directiontransverse to the first direction.

In one variation, the first dimension of the proximal panel isapproximately equal to the first dimension of the central portion of theplatform. In another variation, the second dimension of the proximalpanel is approximately equal to one-half of the second dimension of theend portions of the platform minus one-half of the second dimension ofthe central portion of the platform. In yet another variation, the firstdimension of the proximal panel is approximately equal to the firstdimension of the central portion of the platform. In still anothervariation, the plurality of support elements extend substantiallydownwardly from each end portion of the platform to define a verticaldimension of the platform. The second dimension of the distal panel isapproximately equal to the vertical dimension of the platform.

The side walls are adapted to hinge along the first fold line and thesecond fold line extending in the first direction to bring the sidewalls into proximity to a food item seated on the platform. In oneexample, the proximal panel forms an angle with respect to the platformof from about 90° to about 180°. In another example, the distal panelforms an angle with respect to the proximal panel of from about 90° toabout 180°. Numerous other configurations are contemplated by theinvention.

If desired, the various blanks and/or constructs may include one or moremicrowave energy interactive elements that enhance the heating,browning, and/or crisping of a food item in a microwave oven. In oneexample, the microwave energy interactive element comprises a microwaveenergy interactive material overlying at least a portion of the mainpanel or platform. In another example, the microwave energy interactivematerial overlies at least a portion of at least one side panel or wall.

The microwave energy interactive material may be selected from the groupconsisting of a layer of aluminum, a layer of indium tin oxide, or anycombination thereof. The layer of microwave energy interactive materialtypically may have a thickness of less than about 100 angstroms, forexample, from about 60 to about 100 angstroms, but may have anythickness sufficient to convert at least a portion of impingingmicrowave energy into thermal energy.

If desired, any of the various blanks and/or constructs also may includeat least one venting aperture to enhance heating, browning, and/orcrisping further.

Other features, aspects, and embodiments will be apparent from thefollowing description and accompanying figures.

BRIEF DESCRIPTION OF THE DRAWINGS

The description refers to the accompanying drawings in which likereference characters refer to like parts throughout the several views,and in which:

FIG. 1A is a schematic perspective view of an exemplary construct forheating, browning, and/or crisping a food item in a microwave oven,according to various aspects of the invention;

FIG. 1B is a schematic perspective view of the construct of FIG. 1A inuse, with the side walls extended upwardly, according to various aspectsof the invention;

FIG. 1C is a schematic end view of the construct of FIG. 1B;

FIG. 1D is a schematic end view of the construct of FIG. 1B, having analternate side wall configuration according to various aspects of theinvention;

FIG. 1E is a schematic top plan view of an exemplary blank according tovarious aspects of the invention; and

FIG. 1F is a schematic perspective view of the blank of FIG. 1E,partially erected into the construct of FIG. 1A.

DESCRIPTION

The present invention may be understood further by referring to thefigures. For simplicity, like numerals may be used to describe likefeatures. It will be understood that where a plurality of similarfeatures are depicted, not all of such features necessarily are labeledon each figure. It also will be understood that various components usedto form the blanks and constructs of the present invention may beinterchanged. Thus, while only certain combinations are illustratedherein, numerous other combinations and configurations are contemplatedhereby.

FIG. 1A is a schematic perspective view of an exemplary construct 100(e.g., tray) for heating, browning, and/or crisping a food itemaccording to various aspects of the invention. The construct 100includes a main panel 102 that serves as a platform for supporting afood item F, as illustrated schematically in FIG. 1B. The main panel 102has a substantially planar construction, such that the platform 102 canbe said to lie within a substantially horizontal theoretical plane.However, it will be understood that depending on the material used toform the platform 102 and the particular food item F seated on theplatform 102, the platform 102 may flex downwardly somewhat, forexample, along the longitudinal centerline CL (FIG. 1E), or mayotherwise bend or twist. Thus, it will be understood that the “plane” ofthe main panel or platform 102 (or any other panel) refers anapproximation of the plane in which the main panel or platform generallylies and should not be bound to strict or precise mathematicaldefinitions, calculations, or measurements.

In this example, the main panel or platform 102 has a generallyrectangular shape suitable, for example, for heating a French breadpizza or sandwich. However, it will be understood that numerous othersuitable shapes and configurations may be used to form the platform 102.Examples of other shapes encompassed hereby include, but are not limitedto, polygons, circles, ovals, or any other regular or irregular shape.The shape of the platform 102 may be determined by the shape of the fooditem, and it should be understood that different constructs arecontemplated for different food items, for example, sandwiches, pizzas,French fries, soft pretzels, pizza bites, cheese sticks, pastries,doughs, and so forth. The platform 102 may be sized and shaped toreceive one portion or multiple portions of one or more different fooditems.

Still viewing FIG. 1A, the construct 100 includes a pair ofsubstantially opposed end panels 104 foldably joined to the platform 102along respective lines of disruption, for example, fold lines 106. Theconstruct 100 also includes a pair of substantially opposed side panels108 foldably joined to the platform along respective lines ofdisruption, for example, fold lines 110. The end panels 104 and the sidepanels 108 form non-zero angles with respect to the platform 102, suchthat, for example, panels 104 and 108 are substantially perpendicular tothe platform 102. In this configuration, the end panels 104 and sidepanels 108 generally maintain the platform 102 in an elevated positionand at least partially define a void 112 beneath the platform 102 (FIG.1B). The platform 102 may be characterized as generally having a heightH or substantially vertical dimension approximately equal to that of theend panels 104 and/or side panels 108.

End flaps 114 (i.e., glue flaps) are foldably joined to the side panels108 along oblique lines of disruption, for example, fold lines 116,which serve as corners or corner edges of the construct 100. The endflaps 114 may be in a substantially facing, contacting relationship withthe respective end panels 104 and, if desired, may be joined to the endpanels 104 using an adhesive or other suitable material (not shown).Alternatively, the end flaps 114 may extend from the end panels 104 andmay be adhered or otherwise joined to the respective side panels 108.

If desired, a microwave energy interactive element 118 (shownschematically by stippling) may overlie, may be joined to, and/or maydefine at least a portion of a food-contacting side or surface 120 ofthe platform 102 and, if desired, the outer (exposed) surface of thevarious other panels, for example, all or a portion of end panels 104,side panels 108, and/or end flaps 114. In one example, the microwaveenergy interactive element comprises a susceptor that promotes browningand/or crisping of an outer surface of an adjacent food item. However,other microwave energy interactive elements, such as those describedbelow, are contemplated for use with the invention.

It will be understood that some food items, for example, French breadpizza, have a curved or contoured outer surface that may not be able tobe browned and/or crisped sufficiently by the susceptor 118 on theplatform 102. Thus, according to one aspect of the invention, at least aportion of the construct 100 may be at least partially separated fromthe construct 100 and reconfigured to bring the microwave energyinteractive element 118 into closer proximity with the sides of the fooditem. According to another aspect of the invention, the construct 100may include a plurality of lines of disruption that define one or morepanels or separable portions that may be transformed into side walls forthe platform 102.

For example, in the exemplary construct 100 illustrated schematically inFIG. 1A, a pair of substantially opposed, adjustable side wall portions122 are defined at least partially by substantially vertical, opposedtear lines 124 in the respective side panels 108, substantially opposedtear lines 126 extending from respective fold lines 110 into theplatform 102, and lines of disruption, for example, fold lines 128extending substantially between the endpoints of respective tear lines124. Tear lines 124 and 126 are substantially aligned and may cooperateas a single tear line. The side wall portions 122 are adapted to betransformed into side walls 122 for the platform 102 by tearing alongtear lines 124, 126 and folding along fold line 128, as illustratedschematically in FIGS. 1B and 1C. The end panels 104 and the remainingportions of the side panels 108 serve as support elements for theplatform 102.

In this configuration, a central portion 110′ of fold line 110 dividesthe respective side wall 122 into two sections or panels 108′, 102′,with distal panel 108′ comprising the portion of the respective sidepanel 108 disposed between respective tear lines 124, and proximal panel102′ comprising the portion of the platform or main panel 102circumscribed by respective fold lines 110′, 128 and respective tearline 126. Fold lines 110′, 128 serve as hinges that allow panels 108′,102′ to be adjusted individually as needed to bring the susceptor 118into closer proximity to the surface of the food item F.

It is contemplated that each of panels 102′, 108′ of the adjustablyhinged side walls 122 may be configured in numerous ways to accommodatethe shape and dimensions of the food item F (FIG. 1B) seated on theplatform 102. In the example illustrated schematically in FIG. 1B,panels 102′, 108′ extend upwardly and out of the plane of the foodbearing panel or platform 102 at non-zero angles with respect to panel102, such that panels 102′, 108′ are oblique with respect to one anotherand with respect to the platform 102. However, numerous configurationsare contemplated hereby.

More particularly, as shown schematically in FIG. 1C, each panel 102′may be disposed at an angle α with respect to the platform 102.Likewise, each panel 108′ may be disposed at an angle β with respect tothe respective adjacent panel 102′. In one example, the angles α and βindependently may be from about 90° to about 180°. In another example,the angles α and β independently may be from about 90° to about 135°. Instill another example, the angles α and β independently may be fromabout 135° to about 180°. In each of various other examples, the anglesα and β independently may be from 90° to about 100°, from about 100° toabout 120°, from about 120° to about 130°, from about 130° to about140°, from about 140° to about 150°, from about 150° to about 160°, fromabout 160° to about 170°, or from about 170° to about 180°. In otherexamples, the angles α and β independently may be less than 90°.However, numerous other configurations are contemplated by theinvention.

To use the construct 100 according to one exemplary method, a food itemF may be placed on the main panel or platform 102 between the side walls122, as shown in FIG. 1B, and placed into a microwave oven (not shown).Panels 102′, 108′ of the side walls 122 may be adjusted inwardly,outwardly, upwardly, and/or downwardly, as needed to maximize contactbetween the food item F and the microwave energy interactive element 118overlying and/or defining at least a portion of the interior surface 130of the side walls 122. Likewise, the platform 102 may flex toaccommodate the contours of the bottom of the food item F, for example,a French bread pizza.

During heating, the microwave energy interactive element 118 overlyingthe main panel 102 and the side walls 122, in this example, a susceptor,converts at least a portion of impinging microwave energy to thermalenergy to enhance the heating, browning, and/or crisping of the surfaceof the food item F, for example, the crust of a French bread pizza.Additionally, by maintaining the food item F in an elevated position onthe platform 102, the air in the void 112 between the platform 102 andthe floor of the microwave oven may provide an insulating effect,thereby decreasing the amount of heat loss from the microwave energyinteractive material of the susceptor 118 to the floor of the microwaveoven. As a result, the heating of the food item and the browning and/orcrisping of the bottom and sides of the food item may be enhancedfurther.

If desired, the construct 100 optionally may include one or more ventingapertures 132 that allow water vapor or other gases to diffuse away fromthe food item F during heating, thereby improving browning and/orcrisping of the food item. In this example, the construct 100 includesthree apertures 132 substantially centrally aligned along the length ofthe platform 102, each aperture 132 being substantially circular inshape. However, it will be understood that the number, shape, spacing,and positioning of the apertures may vary depending on the food item tobe heated and the desired degree of browning and crisping, as will bediscussed further below.

It will be apparent that, when the side walls 122 are formed, theoverall shape and dimensions of the platform 102 differ from theoriginal shape and dimensions. More particularly, in this configuration,the central portion 134 of the platform 102 is narrower than the endportions 136 of the platform 102 (FIG. 1B). It is contemplated that, insome instances, it may not be necessary and/or desirable to reduce thewidth of the platform 102 in this manner. For example, where a widerfood item is to be heated, browned, and/or crisped, panel 108′ may beformed into an alternate side wall 122′ by separating the construct 100along tear lines 124 and folding panels 108′ along respective fold lines110, as shown schematically in FIG. 1D. In such a case, panel 108′ mayform an angle γ with respect to the platform 102, which retains itsoriginal substantially rectangular shape. In one example, the angle γmay be from about 90° to about 180°. In another example, the angle γ maybe from about 90° to about 135°. In still another example, the angle γmay be from about 135° to about 180°. In each of various other examples,the angle γ may be from 90° to about 100°, from about 100° to about120°, from about 120° to about 130°, from about 130° to about 140°, fromabout 140° to about 150°, from about 150° to about 160°, from about 160°to about 170°, or from about 170° to about 180°. In other examples, theangle γ may be less than 90°.

FIG. 1E depicts a schematic top plan view of an exemplary blank 138 thatmay be used to form the construct 100 of FIG. 1A according to variousaspects of the present invention. The blank 100 includes a plurality ofpanels joined along lines of disruption, for example, fold lines. Theblank 100 and each of the various panels generally has a firstdimension, for example, a length, extending in a first direction, forexample, a longitudinal direction, D1, and a second dimension, forexample, a width, extending in a second direction, for example, atransverse direction, D2. It will be understood that such designationsare made only for convenience and do not necessarily refer to or limitthe manner in which the blank is manufactured or erected into theconstruct. The blank 138 may be symmetric or nearly symmetric about atransverse centerline CT and along a longitudinal centerline CL.Therefore, certain elements in the drawing figures may have similar oridentical reference numerals to reflect the whole or partial symmetry.

As shown in FIG. 1E, the blank 138 includes a main panel 102 suitable,for example, for heating a French bread pizza or sandwich thereon. Endpanels 104 extend from a first pair of substantially parallel peripheraledges of the main panel 102 along respective transverse fold lines 106.Side panels 108 extend from a second pair of peripheral edges alongrespective longitudinal fold lines 110, such that fold lines 106, 110are substantially perpendicular. In this example, the end panels 104 andside panels 108 are substantially trapezoidal in shape, with the wider“leg” or “base” of each trapezoidal panel defining a portion of aperipheral edge 142 of the blank 138. However, other shapes arecontemplated hereby. End flaps (i.e. glue flaps) 114 extend from opposedlongitudinal ends of each side panel 108 along respective oblique foldlines 116. End flaps 114 are separated from the respective end panels104 by respective oblique cuts 140.

The blank 138 also includes a plurality of lines of disruption, forexample, substantially collinear transverse tear lines 124, 126 andlongitudinal fold lines 128, which collectively define a pair ofsubstantially opposed wall portions 122. Fold lines 128 extendsubstantially between respective the end points of tear lines 126 andare substantially parallel to longitudinal fold lines 110.

A microwave energy interactive element 118 (shown schematically bystippling), for example, a susceptor, optionally may overlie all or aportion of the various panels of the blank 138. In this example, themicrowave energy interactive element 118 overlies substantially all ofone surface of the blank 138 and at least partially defines afood-contacting surface 120.

If desired, the blank 138 may include one or more venting apertures 132extending through the thickness of the blank 138, as will be discussedfurther below.

According to one exemplary method of forming of the blank 138 into theconstruct 100, end panels 104 may be folded along fold lines 106 out ofthe plane of the main panel 102 away from the food-contacting surface120. Likewise, side panels 108 may be folded along fold lines 110 out ofplane of the main panel 102 away from the food-contacting surface. Endflaps 114 may be folded towards end panels 106 along oblique fold lines116 and may, if desired, be joined to the respective end panels 104using glue, other adhesives, or any other suitable chemical ormechanical means or fasteners to form the construct 100, as shown inFIG. 1A.

As discussed previously, walls 122 may be formed by separating thevarious panels along tear lines 124, 126, and folding panels 108′, 102′out of the plane of the platform 102 as needed for the particular fooditem. Alternatively, walls 122′ may be formed by separating the variouspanels along tear lines 124 and folding panel 108′ along fold line 110towards the surface of the food item.

Numerous materials may be suitable for use in forming the various blanksand constructs of the invention, provided that the materials areresistant to softening, scorching, combusting, or degrading at typicalmicrowave oven heating temperatures, for example, from about 250° F. toabout 425° F. The particular materials used may include microwave energyinteractive materials and microwave energy transparent or inactivematerials.

For example, any of the various blanks and/or constructs of the presentinvention may include one or more features that alter the effect ofmicrowave energy during the heating or cooking of the food item. Forinstance, the construct may include one or more microwave energyinteractive elements (hereinafter sometimes referred to as “microwaveinteractive elements”) that promote browning and/or crisping of aparticular area of the food item, shield a particular area of the fooditem from microwave energy to prevent overcooking thereof, or transmitmicrowave energy towards or away from a particular area of the fooditem. Each microwave interactive element comprises one or more microwaveenergy interactive materials or segments arranged in a particularconfiguration to absorb microwave energy, transmit microwave energy,reflect microwave energy, or direct microwave energy, as needed ordesired for a particular microwave heating construct and food item.

The microwave interactive element may be supported on a microwaveinactive or transparent substrate for ease of handling and/or to preventcontact between the microwave interactive material and the food item. Asa matter of convenience and not limitation, and although it isunderstood that a microwave interactive element supported on a microwavetransparent substrate includes both microwave interactive and microwaveinactive elements or components, such constructs may be referred toherein as “microwave interactive webs”.

The microwave energy interactive material may be an electroconductive orsemiconductive material, for example, a metal or a metal alloy providedas a metal foil; a vacuum deposited metal or metal alloy; or a metallicink, an organic ink, an inorganic ink, a metallic paste, an organicpaste, an inorganic paste, or any combination thereof. Examples ofmetals and metal alloys that may be suitable for use with the presentinvention include, but are not limited to, aluminum, chromium, copper,inconel alloys (nickel-chromium-molybdenum alloy with niobium), iron,magnesium, nickel, stainless steel, tin, titanium, tungsten, and anycombination or alloy thereof.

Alternatively, the microwave energy interactive material may comprise ametal oxide. Examples of metal oxides that may be suitable for use withthe present invention include, but are not limited to, oxides ofaluminum, iron, and tin, used in conjunction with an electricallyconductive material where needed. Another example of a metal oxide thatmay be suitable for use with the present invention is indium tin oxide(ITO). ITO can be used as a microwave energy interactive material toprovide a heating effect, a shielding effect, a browning and/or crispingeffect, or a combination thereof. For example, to form a susceptor, ITOmay be sputtered onto a clear polymer film. The sputtering processtypically occurs at a lower temperature than the evaporative depositionprocess used for metal deposition. ITO has a more uniform crystalstructure and, therefore, is clear at most coating thicknesses.Additionally, ITO can be used for either heating or field managementeffects. ITO also may have fewer defects than metals, thereby makingthick coatings of ITO more suitable for field management than thickcoatings of metals, such as aluminum.

Alternatively, the microwave energy interactive material may comprise asuitable electroconductive, semiconductive, or non-conductive artificialdielectric or ferroelectric. Artificial dielectrics comprise conductive,subdivided material in a polymeric vehicle or other suitable matrix orbinder, and may include flakes of an electroconductive metal, forexample, aluminum.

In one example, the microwave interactive element may comprise a thinlayer of microwave interactive material (generally less than about 100angstroms in thickness, for example, from about 60 to about 100angstroms in thickness) that tends to absorb at least a portion ofimpinging microwave energy and convert it to thermal energy (i.e., heat)at the interface with a food item. Such elements often are used topromote browning and/or crisping of the surface of a food item(sometimes referred to as a “browning and/or crisping element”). Whensupported on a film or other substrate, such an element may be referredto as a “susceptor film” or, simply, “susceptor”. In the example shownin FIG. 1E, the blank 138 includes a susceptor film 118 substantiallyoverlying and joined to at least a portion of the blank 138 to form atleast a portion of a first surface 120, which may serve as afood-contacting or food bearing surface. However, other microwave energyinteractive elements, such as those described herein, are contemplatedfor use with the invention. A second surface 144 (FIG. 1B) opposite thefirst surface 120 also may include one or more microwave energyinteractive elements if desired.

In another example, the microwave interactive element may comprise afoil having a thickness sufficient to shield one or more selectedportions of the food item from microwave energy (sometimes referred toas a “shielding element”). Such shielding elements may be used where thefood item is prone to scorching or drying out during heating.

The shielding element may be formed from various materials and may havevarious configurations, depending on the particular application forwhich the shielding element is used. Typically, the shielding element isformed from a conductive, reflective metal or metal alloy, for example,aluminum, copper, or stainless steel, in the form of a solid “patch”.The shielding element generally may have a thickness of from about0.000285 inches to about 0.05 inches. In one aspect, the shieldingelement has a thickness of from about 0.0003 inches to about 0.03inches. In another aspect, the shielding element has a thickness of fromabout 0.00035 inches to about 0.020 inches, for example, 0.016 inches.

As still another example, the microwave interactive element may comprisea segmented foil or high optical density evaporated material(collectively referred to as “segmented foil”), such as, but not limitedto, those described in U.S. Pat. Nos. 6,204,492, 6,433,322, 6,552,315,and 6,677,563, each of which is incorporated by reference in itsentirety. Although segmented foils are not continuous, appropriatelyspaced groupings of such segments often act as a transmitting element todirect microwave energy to specific areas of the food item. Such foilsalso may be used in combination with browning and/or crisping elements,for example, susceptors.

Any of the numerous microwave interactive elements described herein orcontemplated hereby may be substantially continuous, that is, withoutsubstantial breaks or interruptions, or may be discontinuous, forexample, by including one or more breaks or apertures that transmitmicrowave energy therethrough. The breaks or apertures may be sized andpositioned to heat particular areas of the food item selectively. Thenumber, shape, size, and positioning of such breaks or apertures mayvary for a particular application depending on type of construct beingformed, the food item to be heated therein or thereon, the desireddegree of shielding, browning, and/or crisping, whether direct exposureto microwave energy is needed or desired to attain uniform heating ofthe food item, the need for regulating the change in temperature of thefood item through direct heating, and whether and to what extent thereis a need for venting.

It will be understood that the aperture may be a physical aperture orvoid (e.g., venting apertures 132) in the material used to form theconstruct, or may be a non-physical “aperture”. A non-physical aperturemay be a portion of the construct that is microwave energy inactive bydeactivation or otherwise, or one that is otherwise transparent tomicrowave energy. Thus, for example, the aperture may be a portion ofthe construct formed without a microwave energy active material or,alternatively, may be a portion of the construct formed with a microwaveenergy active material that has been deactivated. While both physicaland non-physical apertures allow the food item to be heated directly bythe microwave energy, a physical aperture also provides a ventingfunction to allow steam or other vapors to be released from the fooditem.

In some instances, it may be beneficial to create one or morediscontinuities or inactive regions to prevent overheating or charringof the construct. By way of example, and not limitation, in theconstruct 100 illustrated in FIGS. 1A-1C, the end flaps 114 and aportion of the end panels 104 are overlapped and in intimate and/orproximate contact with one another. When exposed to microwave energy,the concentration of heat generated by the overlapped panels may besufficient to cause the underlying support, in this case, paperboard, tobecome scorched. As such, the overlapping portions of panels 104, 114may be designed to be microwave energy transparent, for example, byforming these areas of the blank 138 without a microwave energyinteractive material, removing any microwave energy interactive materialthat has been applied, or by deactivating the microwave energyinteractive material in these areas.

Further still, one or more panels, portions of panels, or portions ofthe construct may be designed to be microwave energy inactive to ensurethat the microwave energy is focused efficiently on the areas to bebrowned and/or crisped, rather than being lost to portions of the fooditem not intended to be browned and/or crisped or to the heatingenvironment. By way of example, and not limitation, in the construct 100illustrated in FIG. 1A, end panels 104 are in a substantially verticalconfiguration extending downwardly from the main panel 102 on which thefood item rests. In this configuration, the end panels 104 are notlikely to be in proximate or intimate contact with any portion of thefood item intended to be browned and/or crisped. This may be achievedusing any suitable technique, such as those described above.

As stated above, any of the above elements and numerous otherscontemplated hereby may be supported on a substrate. The substratetypically comprises an electrical insulator, for example, a polymer filmor other polymeric material. As used herein, the term “polymer” or“polymeric material” includes, but is not limited to, homopolymers,copolymers, such as for example, block, graft, random, and alternatingcopolymers, terpolymers, etc. and blends and modifications thereof.Furthermore, unless otherwise specifically limited, the term “polymer”shall include all possible geometrical configurations of the molecule.These configurations include, but are not limited to isotactic,syndiotactic, and random symmetries.

The thickness of the film typically may be from about 35 gauge to about10 mil. In one aspect, the thickness of the film is from about 40 toabout 80 gauge. In another aspect, the thickness of the film is fromabout 45 to about 50 gauge. In still another aspect, the thickness ofthe film is about 48 gauge. Examples of polymer films that may besuitable include, but are not limited to, polyolefins, polyesters,polyamides, polyimides, polysulfones, polyether ketones, cellophanes, orany combination thereof. Other non-conducting substrate materials suchas paper and paper laminates, metal oxides, silicates, cellulosics, orany combination thereof, also may be used.

In one example, the polymer film comprises polyethylene terephthalate(PET). Polyethylene terephthalate films are used in commerciallyavailable susceptors, for example, the QWIKWAVE® Focus susceptor and theMICRORITE® susceptor, both available from Graphic PackagingInternational (Marietta, Ga.). Examples of polyethylene terephthalatefilms that may be suitable for use as the substrate include, but are notlimited to, MELINEX®, commercially available from DuPont Teijan Films(Hopewell, Va.), SKYROL, commercially available from SKC, Inc.(Covington, Ga.), and BARRIALOX PET, available from Toray Films (FrontRoyal, Va.), and QU50 High Barrier Coated PET, available from TorayFilms (Front Royal, Va.).

The polymer film may be selected to impart various properties to themicrowave interactive web, for example, printability, heat resistance,or any other property. As one particular example, the polymer film maybe selected to provide a water barrier, oxygen barrier, or a combinationthereof. Such barrier film layers may be formed from a polymer filmhaving barrier properties or from any other barrier layer or coating asdesired. Suitable polymer films may include, but are not limited to,ethylene vinyl alcohol, barrier nylon, polyvinylidene chloride, barrierfluoropolymer, nylon 6, nylon 6,6, coextruded nylon 6/EVOH/nylon 6,silicon oxide coated film, barrier polyethylene terephthalate, or anycombination thereof.

One example of a barrier film that may be suitable for use with thepresent invention is CAPRAN® EMBLEM 1200M nylon 6, commerciallyavailable from Honeywell International (Pottsville, Pa.). Anotherexample of a barrier film that may be suitable is CAPRAN®OXYSHIELD OBSmonoaxially oriented coextruded nylon 6/ethylene vinyl alcohol(EVOH)/nylon 6, also commercially available from HoneywellInternational. Yet another example of a barrier film that may besuitable for use with the present invention is DARTEK® N-201 nylon 6,6,commercially available from Enhance Packaging Technologies (Webster,N.Y.). Additional examples include BARRIALOX PET, available from TorayFilms (Front Royal, Va.) and QU50 High Barrier Coated PET, availablefrom Toray Films (Front Royal, Va.), referred to above.

Still other barrier films include silicon oxide coated films, such asthose available from Sheldahl Films (Northfield, Minn.). Thus, in oneexample, a susceptor may have a structure including a film, for example,polyethylene terephthalate, with a layer of silicon oxide coated ontothe film, and ITO or other material deposited over the silicon oxide. Ifneeded or desired, additional layers or coatings may be provided toshield the individual layers from damage during processing.

The barrier film may have an oxygen transmission rate (OTR) as measuredusing ASTM D3985 of less than about 20 cc/m²/day. In one aspect, thebarrier film has an OTR of less than about 10 cc/m²/day. In anotheraspect, the barrier film has an OTR of less than about 1 cc/m²/day. Instill another aspect, the barrier film has an OTR of less than about 0.5cc/m²/day. In yet another aspect, the barrier film has an OTR of lessthan about 0.1 cc/m²/day.

The barrier film may have a water vapor transmission rate (WVTR) of lessthan about 100 g/m²/day as measured using ASTM F1249. In one aspect, thebarrier film has a WVTR of less than about 50 g/m²/day. In anotheraspect, the barrier film has a WVTR of less than about 15 g/m²/day. Inyet another aspect, the barrier film has a WVTR of less than about 1g/m²/day. In still another aspect, the barrier film has a WVTR of lessthan about 0.1 g/m²/day. In a still further aspect, the barrier film hasa WVTR of less than about 0.05 g/m²/day.

Other non-conducting substrate materials such as metal oxides,silicates, cellulosics, or any combination thereof, also may be used inaccordance with the present invention.

The microwave energy interactive material may be applied to thesubstrate in any suitable manner, and in some instances, the microwaveenergy interactive material is printed on, extruded onto, sputteredonto, evaporated on, or laminated to the substrate. The microwave energyinteractive material may be applied to the substrate in any pattern, andusing any technique, to achieve the desired heating effect of the fooditem.

For example, the microwave energy interactive material may be providedas a continuous or discontinuous layer or coating including circles,loops, hexagons, islands, squares, rectangles, octagons, and so forth.Examples of various patterns and methods that may be suitable for usewith the present invention are provided in U.S. Pat. Nos. 6,765,182;6,717,121; 6,677,563; 6,552,315; 6,455,827; 6,433,322; 6,414,290;6,251,451; 6,204,492; 6,150,646; 6,114,679; 5,800,724; 5,759,422;5,672,407; 5,628,921; 5,519,195; 5,424,517; 5,410,135; 5,354,973;5,340,436; 5,266,386; 5,260,537; 5,221,419; 5,213,902; 5,117,078;5,039,364; 4,963,424; 4,936,935; 4,890,439; 4,775,771; 4,865,921; andRe. 34,683, each of which is incorporated by reference herein in itsentirety. Although particular examples of patterns of microwave energyinteractive material are shown and described herein, it should beunderstood that other patterns of microwave energy interactive materialare contemplated by the present invention.

The microwave interactive element or microwave interactive web may bejoined to or overlie a dimensionally stable, microwave energytransparent support (hereinafter referred to as “microwave transparentsupport”, “microwave inactive support” or “support”) to form theconstruct.

In one aspect, for example, where a rigid or semi-rigid construct is tobe formed, all or a portion of the support may be formed at leastpartially from a paperboard material, which may be cut into a blankprior to use in the construct. For example, the support may be formedfrom paperboard having a basis weight of from about 60 to about 330lbs/ream (lbs/3000 sq. ft.), for example, from about 80 to about 140lbs/ream. The paperboard generally may have a thickness of from about 6to about 30 mils, for example, from about 12 to about 28 mils. In oneparticular example, the paperboard has a thickness of about 12 mils. Anysuitable paperboard may be used, for example, a solid bleached or solidunbleached sulfate board, such as SUS® board, commercially availablefrom Graphic Packaging International.

In another aspect, where a more flexible construct is to be formed, thesupport may comprise a paper or paper-based material generally having abasis weight of from about 15 to about 60 lbs/ream, for example, fromabout 20 to about 40 lbs/ream. In one particular example, the paper hasa basis weight of about 25 lbs/ream.

Optionally, one or more portions of the various blanks or otherconstructs described herein or contemplated hereby may be coated withvarnish, clay, or other materials, either alone or in combination. Thecoating may then be printed over with product advertising or otherinformation or images. The blanks or other constructs also may be coatedto protect any information printed thereon.

Furthermore, the blanks or other constructs may be coated with, forexample, a moisture and/or oxygen barrier layer, on either or bothsides, such as those described above. Any suitable moisture and/oroxygen barrier material may be used in accordance with the presentinvention. Examples of materials that may be suitable include, but arenot limited to, polyvinylidene chloride, ethylene vinyl alcohol, DuPontDARTEK™ nylon 6,6, and others referred to above.

Alternatively or additionally, any of the blanks or other constructs ofthe present invention may be coated or laminated with other materials toimpart other properties, such as absorbency, repellency, opacity, color,printability, stiffness, or cushioning. For example, absorbentsusceptors are described in U.S. Provisional Application No. 60/604,637,filed Aug. 25, 2004, and U.S. Patent Application Publication No. US2006/0049190 A1, published Mar. 9, 2006, both of which are incorporatedherein by reference in their entirety. Additionally, the blanks or otherconstructs may include graphics or indicia printed thereon.

It will be understood that with some combinations of elements andmaterials, the microwave interactive element may have a grey or silvercolor this is visually distinguishable from the substrate or thesupport. However, in some instances, it may be desirable to provide aweb or construct having a uniform color and/or appearance. Such a web orconstruct may be more aesthetically pleasing to a consumer, particularlywhen the consumer is accustomed to packages or containers having certainvisual attributes, for example, a solid color, a particular pattern, andso on. Thus, for example, the present invention contemplates using asilver or grey toned adhesive to join the microwave interactive elementsto the substrate, using a silver or grey toned substrate to mask thepresence of the silver or grey toned microwave interactive element,using a dark toned substrate, for example, a black toned substrate, toconceal the presence of the silver or grey toned microwave interactiveelement, overprinting the metallized side of the web with a silver orgrey toned ink to obscure the color variation, printing thenon-metallized side of the web with a silver or grey ink or otherconcealing color in a suitable pattern or as a solid color layer to maskor conceal the presence of the microwave interactive element, or anyother suitable technique or combination thereof.

Various aspects of the invention may be illustrated further by way ofthe following examples, which are not to be construed as limiting in anymanner.

EXAMPLE 1

A construct for heating, browning, and crisping a food item similar tothe construct of FIGS. 1A-1C was formed from a blank similar to theblank of FIG. 1E. A commercially available French bread pizza was placedon the platform between the upwardly extending walls with the sides ofthe French bread pizza in proximate or intimate contact with thesusceptor defining the interior surface of the walls. The French breadpizza was heated in a 1000 watt Panasonic microwave oven for about 3minutes. Excellent heating, browning, and crisping of the French breadpizza was obtained.

EXAMPLE 2

A construct for heating, browning, and/or crisping a food item similarto the construct of FIGS. 1A-1C was formed using a blank similar to theblank of FIG. 1E. A commercially available French bread pizza was placedon the food bearing panel between the upwardly extending side panels orwalls with the sides of the French bread pizza in proximate or intimatecontact with the susceptor defining the interior surface of the walls.The French bread pizza was heated in an 800 watt Sharp microwave ovenfor about 2.5 minutes. Excellent heating, browning, and crisping of theFrench bread pizza was obtained.

It will be understood that in each of the various blanks and constructsdescribed herein and contemplated hereby, a “fold line” can be anysubstantially linear, although not necessarily straight, form ofweakening that facilitates folding therealong. More specifically, butnot for the purpose of narrowing the scope of the present invention, afold line may be a score line, such as lines formed with a blunt scoringknife, or the like, which creates a crushed portion in the materialalong the desired line of weakness; a cut that extends partially into amaterial along the desired line of weakness, and/or a series of cutsthat extend partially into and/or completely through the material alongthe desired line of weakness; or any combination of these features.

A “tear line” can be any at least somewhat line-like arranged, althoughnot necessarily straight, form of weakening that facilitates tearingtherealong. More specifically, but not for the purpose of narrowing thescope of the present invention, a tear line may include: a slit thatextends partially into the material along the desired line of weakness;and/or a series of spaced apart slits that extend partially into and/orcompletely through the material along the desired line of weakness; orany combination of these features.

As a more specific example, one type of conventional tear line is in theform of a series of spaced apart slits that extend completely throughthe material, with adjacent slits being spaced apart slightly so that anick (e.g., a small somewhat bridging-like piece of the material) isdefined between the adjacent slits for typically temporarily connectingthe material across the tear line. The nicks are broken during tearingalong the tear line. The nicks typically are a relatively smallpercentage of the tear line, and alternatively the nicks can be omittedfrom or torn in a tear line such that the tear line is a continuous cut.That is, it is within the scope of the present invention for each of thetear lines to be replaced with a continuous cut, slit, or the like.

Furthermore, various exemplary blanks and constructs are shown anddescribed herein as having fold lines, tear lines, score lines, cuts orcut lines, kiss cut lines, and other lines as extending from aparticular feature to another particular feature, for example from oneparticular panel to another, from one particular edge to another, or anycombination thereof. However, it will be understood that such lines neednot necessarily extend between such features in a precise manner.Instead, such lines may generally extend between the various features asneeded to achieve the objective of such line. For instance, where aparticular tear line is shown as extending from a first edge of a blankto another edge of the blank, the tear line need not extend completelyto one or both of such edges. Rather, the tear line need only extend toa location sufficiently proximate to the edge so that the removablestrip, panel, or portion can be manually separated from the blank orconstruct without causing undesirable damage thereto.

While various examples of constructs are provided herein, it will beunderstood that any configuration of components may be used as needed ordesired. The construct may be flexible, semi-rigid, rigid, or mayinclude a variety of components having different degrees of flexibility.Additionally, it should be understood that the present inventioncontemplates constructs for single-serving portions and formultiple-serving portions. It also should be understood that variouscomponents used to form the constructs of the present invention may beinterchanged. Thus, while only certain combinations are illustratedherein, numerous other combinations and configurations are contemplatedhereby.

Although certain embodiments of this invention have been described witha certain degree of particularity, those skilled in the art could makenumerous alterations to the disclosed embodiments without departing fromthe spirit or scope of this invention. All directional references (e.g.,upper, lower, upward, downward, left, right, leftward, rightward, top,bottom, above, below, vertical, horizontal, clockwise, andcounterclockwise) are used only for identification purposes to aid thereader's understanding of the various embodiments of the presentinvention, and do not create limitations, particularly as to theposition, orientation, or use of the invention unless specifically setforth in the claims. Joinder references (e.g., joined, attached,coupled, connected, and the like) are to be construed broadly and mayinclude intermediate members between a connection of elements andrelative movement between elements. As such, joinder references do notnecessarily imply that two elements are connected directly and in fixedrelation to each other.

It will be readily understood by those persons skilled in the art that,in view of the above detailed description of the invention, the presentinvention is susceptible of broad utility and application. Manyadaptations of the present invention other than those herein described,as well as many variations, modifications, and equivalent arrangementswill be apparent from or reasonably suggested by the present inventionand the above detailed description thereof, without departing from thesubstance or scope of the present invention.

It is intended that all matter contained in the above description orshown in the accompanying drawings shall be interpreted as illustrativeonly and not limiting. For example, various elements discussed withreference to the various embodiments may be interchanged to createentirely new embodiments coming within the scope of the presentinvention. Furthermore, changes in detail or structure may be madewithout departing from the spirit of the invention. Thus, the detaileddescription set forth herein is not intended nor is to be construed tolimit the present invention or otherwise to exclude any such otherembodiments, adaptations, variations, modifications, and equivalentarrangements of the present invention. Rather, the description is onlyillustrative and exemplary of the present invention and is made merelyfor purposes of providing a full and enabling disclosure of the presentinvention and to provide the best mode contemplated by the inventor orinventors of carrying out the invention.

Thus, while the present invention has been discussed above withreference to exemplary embodiments, various additions, modifications andchanges can be made thereto without departing from the spirit and scopeof the invention as set forth in the following claims.

What is claimed is:
 1. A microwave heating construct for a food item,comprising: a platform; a layer of microwave energy interactive materialoverlying at least a portion of the platform; a pair of side panelsextending substantially downwardly from a first pair of opposed edges ofthe platform along respective first fold lines extending in a firstdirection, each side panel of the pair of side panels including a pairof substantially vertical lines of disruption defining at least aportion of an adjustable wall portion between the respective first foldline and a respective peripheral edge of the side panel opposite thefirst fold line, wherein each of the vertical lines of disruption of therespective pair of vertical lines of disruption extends in therespective side panel of the pair of side panels, and each of theadjustable wall portions extends in at least the respective side panelof the pair of side panels and is foldably connected to the platform;and a pair of end panels extending substantially downwardly from asecond pair of opposed edges of the platform along respective secondfold lines extending in a second direction substantially perpendicularto the first direction.
 2. The construct of claim 1, wherein the layerof microwave energy interactive material further overlies each sidepanel of the pair of side panels between the respective pair of verticallines of disruption.
 3. The construct of claim 1, wherein the adjustablewall portions are adapted to be transformed into walls for the platformby tearing along the vertical lines of disruption in the side panels androtating the adjustable wall portions upwardly along the respectivefirst fold lines.
 4. A microwave heating construct for a food item,comprising: a platform; a layer of microwave energy interactive materialoverlying at least a portion of the platform; a pair of side panelsextending substantially downwardly from a first pair of opposed edges ofthe platform along respective first fold lines extending in a firstdirection, each side panel of the pair of side panels including a pairof substantially vertical lines of disruption defining at least aportion of an adjustable wall portion between the respective first foldline and a respective peripheral edge of the side panel opposite thefirst fold line; and a pair of end panels extending substantiallydownwardly from a second pair of opposed edges of the platform alongrespective second fold lines extending in a second directionsubstantially perpendicular to the first direction; wherein for eachadjustable wall portion, the adjustable wall portion is further definedat least partially by a pair of tear lines extending in the seconddirection from the respective first fold line into the platform, thepair of tear lines being substantially aligned with the pair of verticallines of disruption in the respective side panel.
 5. The construct ofclaim 4, wherein for each adjustable wall portion, the adjustable wallportion is further defined at least partially by a line of disruptionextending in the first direction substantially between endpoints of therespective pair of tear lines extending from the respective first foldline into the platform.
 6. The construct of claim 5, wherein for eachadjustable wall portion, the respective first fold line divides theadjustable wall portion into a proximal section disposed between therespective line of disruption extending in the first direction and therespective first fold line, and a distal section disposed between therespective first fold line and the respective peripheral edge of theadjustable wall portion.
 7. The construct of claim 6, wherein eachadjustable wall portion is adapted to be transformed into a wall for theplatform by tearing along the vertical lines of disruption in therespective side panel and along the respective tear lines extending intothe platform, and rotating at least one of the proximal section anddistal section of the adjustable wall portion upwardly along at leastone of the respective first fold line and the respective line ofdisruption extending in the first direction.
 8. The construct of claim7, wherein the platform is adapted to receive the food item, and thewalls are adapted to hinge along the respective lines of disruption andrespective first fold lines to bring the proximal section and distalsection of each wall into proximity with the food item.
 9. The constructof claim 7, wherein for at least one wall, the proximal section of thewall forms an angle with respect to the platform of from about 90° toabout 180°.
 10. The construct of claim 7, wherein for at least one wall,the distal section of the wall forms an angle with respect to therespective proximal section of from about 90° to about 180°.
 11. Theconstruct of claim 1, further comprising a respective pair of end flapsfoldably joined to respective opposite ends of each side panel alongrespective oblique fold lines.
 12. The construct of claim 11, whereinthe end flaps of each respective pair of end flaps are in asubstantially contacting, facing relationship with the respective endpanel.
 13. The construct of claim 11, wherein the end flaps areadhesively joined to the respective end panel.
 14. The construct ofclaim 1, wherein the microwave energy interactive material is selectedfrom the group consisting of aluminum, indium tin oxide, and anycombination thereof.
 15. The construct of claim 1, wherein the layer ofmicrowave energy interactive material has a thickness of from about 60to about 100 angstroms.
 16. A microwave heating construct for a fooditem, comprising: a platform including a central portion having a firstdimension extending in a first direction and a second dimensionextending in a second direction substantially perpendicular to the firstdirection, and a pair of end portions at opposite ends of the centralportion, each end portion having a first dimension extending in thefirst direction and a second dimension extending in the seconddirection, the second dimension of each end portion being greater thanthe second dimension of the central portion; a plurality of supportelements extending downwardly from each end portion of the platform; apair of adjustable side walls, each adjustable side wall of the pair ofadjustable side walls including a proximal panel hingedly joined to thecentral portion of the platform along a first fold line extending in thefirst direction, and a distal panel hingedly joined to the proximalpanel along a second fold line extending in the first direction; and alayer of microwave energy interactive material overlying at least aportion of the platform and the side walls.
 17. The construct of claim16, wherein for each adjustable side wall of the pair of adjustable sidewalls, the proximal panel has a first dimension extending in the firstdirection and a second dimension extending in a crosswise directiontransverse to the first direction, and the first dimension of theproximal panel is approximately equal to the first dimension of thecentral portion of the platform.
 18. The construct of claim 16, whereinfor each adjustable side wall of the pair of adjustable side walls, theproximal panel has a first dimension extending in the first directionand a second dimension extending in a crosswise direction transverse tothe first direction, and the second dimension of the proximal panel isapproximately equal to one-half of the second dimension of the endportions of the platform minus one-half of the second dimension of thecentral portion of the platform.
 19. The construct of claim 16, whereinfor each adjustable side wall of the pair of adjustable side walls, thedistal panel has a first dimension extending in the first direction anda second dimension extending in a crosswise direction transverse to thefirst direction, and the first dimension of the distal panel isapproximately equal to the first dimension of the central portion of theplatform.
 20. A blank for forming a construct, comprising: a pluralityof adjoined panels, each having a first dimension extending in alongitudinal direction and a second dimension extending in a transversedirection substantially perpendicular to the first direction, theplurality of panels including a main panel, a pair of substantiallyopposed side panels foldably joined to the main panel along respectivesubstantially opposed longitudinal fold lines, and a pair ofsubstantially opposed end panels foldably joined to the main panel alongrespective substantially opposed transverse fold lines; and a pair ofsubstantially opposed side portions adapted to be at least partiallyseparated from a remainder of the blank, each side portion of the pairof side portions being defined by a pair of substantially opposedtransverse tear lines extending substantially across the respective sidepanel into the main panel, and a longitudinal line of disruptionextending between the respective pair of substantially opposedtransverse tear lines.
 21. The construct of claim 1, wherein each of thevertical lines of disruption extends from the respective first fold lineto the respective peripheral edge of the respective side panel of thepair of side panels.
 22. A microwave heating construct, comprising: aplatform; a side panel foldably connected to the platform along a firstfold line, at least a portion of the side panel extending generallydownwardly from the platform; an end panel foldably connected to theplatform along a second fold line, at least a portion of the end panelextending generally downwardly from the platform; and an adjustable wallportion extending in at least the platform and the side panel, theadjustable wall portion being foldably connected to the platform along athird fold line and being at least partially separable from the sidepanel along a line of disruption.
 23. The construct of claim 22, whereinthe line of disruption is a first line of disruption, and the adjustablewall portion is at least partially separable from the platform along asecond line of disruption extending from an end of the first line ofdisruption to an end of the third fold line.
 24. The construct of claim23, wherein the adjustable wall portion is further at least partiallyseparable from the side panel along a third line of disruption and fromthe platform along a fourth line of disruption, and the third line ofdisruption and the fourth line of disruption are spaced apart from therespective first line of disruption and second line of disruption. 25.The construct of claim 23, wherein the first line of disruption and thesecond line of disruption are tear lines.
 26. The construct of claim 22,wherein the side panel is a first side panel, the adjustable wallportion is a first adjustable wall portion, and the line of disruptionis a first line of disruption, and the construct further comprises asecond side panel foldably connected to the platform along a fourth foldline and a second adjustable wall portion extending in at least theplatform and the second side panel, the second adjustable wall portionbeing foldably connected to the platform along a fifth fold line andbeing at least partially separable from the second side panel along asecond line of disruption.
 27. The construct of claim 22, wherein thethird fold line extends generally parallel to the first fold line and isspaced apart from the first fold line, and the line of disruption isgenerally perpendicular to the first fold line.
 28. The construct ofclaim 22, wherein the second fold line extends generally perpendicularto the first fold line.
 29. A blank for forming a microwave heatingconstruct, the blank comprising: a main panel for forming a raisedplatform when the construct is formed from the blank; a side panelfoldably connected to the main panel along a first fold line; an endpanel foldably connected to the main panel along a second fold line; andan adjustable wall portion extending in at least the main panel and theside panel, the adjustable wall portion being foldably connected to themain panel along a third fold line and being at least partiallyseparable from the side panel along a line of disruption.
 30. The blankof claim 29, wherein the line of disruption is a first line ofdisruption, and the adjustable wall portion is at least partiallyseparable from the main panel along a second line of disruptionextending from an end of the first line of disruption to an end of thethird fold line.
 31. The blank of claim 30, wherein the adjustable wallportion is further at least partially separable from the side panelalong a third line of disruption and from the main panel along a fourthline of disruption, and the third line of disruption and the fourth lineof disruption are spaced apart from the respective first line ofdisruption and second line of disruption.
 32. The blank of claim 30,wherein the first line of disruption and the second line of disruptionare tear lines.
 33. The blank of claim 29, wherein the side panel is afirst side panel, the adjustable wall portion is a first adjustable wallportion, and the line of disruption is a first line of disruption, andthe blank further comprises a second side panel foldably connected tothe main panel along a fourth fold line and a second adjustable wallportion extending in at least the main panel and the second side panel,the second adjustable wall portion being foldably connected to the mainpanel along a fifth fold line and being at least partially separablefrom the second side panel along a second line of disruption.
 34. Theblank of claim 29, wherein the third fold line extends generallyparallel to the first fold line and is spaced apart from the first foldline, and the line of disruption is generally perpendicular to the firstfold line.
 35. The blank of claim 29, wherein the second fold lineextends generally perpendicular to the first fold line.